JURASSIC CYCADS FROM WYOMING. 197 



Cycadella gelida Ward. 



1900. Cycadella gelida Ward: Proc. Wash. Acad. Sci., Vol. I, p. 281; Twentieth 

 Ann. Rep. U. S. Geol. Surv., 1898-99, Pt. II, p. 414, pi. clxv-clxix. 



From a resemblance in the leaf scars and the general texture a 

 number of small fragments found in the later collections are provisionally 

 referred to this species. 



Cycadella carbonensis Ward. 



1900. Cycadella carbonensis IV 2iJ:d: Proc. Wash. Acad. Sci., Vol. I, p. 282; Twentieth 

 Ann. Rep. U. S. Geol. Surv., 1898-99, Pt. II, p. 415, pi. clxx; pi. clxxi. ' 



In a few spots on the large type specimen, No. 500.2, the leaf scars are 

 seen, and their great size (3 cm. wide by 15 mm. high) was one of the 

 specific characters. Some are not more than 1 cm. high, with the maxi- 

 mum width. One small fragment. No. 500.376, shows scars exactly 

 like these. The texture and color of the rock are also the same, and it 

 is tolerably safe to refer it to this species. 



Cycadella Knjghtii Ward. 



PI. LXI. 



1900. Cycadella KnigTitii Ward: Proc. Wash. Acad. Sci., Vol. I, p. 28.3, pi. xxi. 

 Twentieth Ann. Rep. U. S. Geol. Surv., 1898-99, Pt. II, p. 416, pi. 

 clxxii-clxxvii. 



Only one specimen in the latter collection belongs with any certainty 

 to this species, which was represented in the original collection by only 

 two specimens, viz, Nos. 500.65 and 500.33, the former one of the largest 

 and finest trunks found. The specimen now in question, though some- 

 what smaller than that, is also a large and practically complete trunk. 

 It is the No. 500.687, collected by myself. It is much compressed later- 

 ally, deeply hollowed, and much distorted on one side. The other side 

 is normal in shape and well preserved, but was so completely incrusted 

 with lime that it was necessary to place it in a vat of muriatic acid for a 

 considerable period. As this was the only side that showed the scars 

 sufficiently well for determination, I was uncertain until the hme was 

 removed to what species it belonged. It proves to be C. Knightii, and 

 is therefore the third specimen of that species known. It is consider- 

 ably smaller than the type specimen, No. 500.65, and about the size 



